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ESB-2015.2571 - [Virtual][Cisco] Cisco Unified Communications Manager: Denial of service - Remote/unauthenticated

Date: 12 October 2015

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.2571
       Cisco Unified Communications Manager IM and Presence Service
                 REST API Denial of Service Vulnerability
                              12 October 2015

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco Unified Communications Manager
Publisher:         Cisco Systems
Operating System:  Cisco
                   VMware ESX Server
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2015-6310  

Original Bulletin: 
   http://tools.cisco.com/security/center/viewAlert.x?alertId=41242

- --------------------------BEGIN INCLUDED TEXT--------------------

Vulnerability Alert

Cisco Unified Communications Manager IM and Presence Service REST API Denial 
of Service Vulnerability

Threat Type: CWE-399: Resource Management Errors

IntelliShield ID: 41242

Version: 1

First Published: 2015 October 02 14:26 GMT

Last Published: 2015 October 02 14:26 GMT

Port: Not available

CVE: CVE-2015-6310

Urgency: Unlikely Use

Credibility: Confirmed

Severity: Mild Damage

CVSS Base: 5.0

CVSS Version 2.0

Version Summary: Cisco Unified Communications Manager IM and Presence Service
contains a vulnerability that could allow an unauthenticated, remote attacker
to cause a denial of service condition. Updates are not available.

Description

A vulnerability in the Representational State Transfer (REST) interface of the
Cisco Unified Communications Manager IM and Presence Service could allow an 
unauthenticated, remote attacker to cause a partial denial of service (DoS) 
condition because the Cisco Session Initiation Protocol (SIP) proxy service 
can unexpectedly restart.

The vulnerability is due to lack of proper input validation of the HTTP 
request when it is sent to the REST interface. An attacker could exploit this
vulnerability by sending a crafted HTTP request to the REST interface of the 
affected application. An exploit could allow the attacker to cause a partial 
DoS condition because the Cisco SIP proxy service can unexpectedly restart.

Cisco has confirmed the vulnerability; however, software updates are not 
available.

Warning Indicators

At the time this alert was first published, Cisco Unified Communications 
Manager IM and Presence Service release 11.5(1) was vulnerable. Later releases
may also be vulnerable.

IntelliShield Analysis

To exploit the vulnerability, an unauthenticated attacker must reach the REST
interface and send a crafted HTTP request to the device. This requirement may
reduce the likelihood of a successful exploit.

Cisco indicates through the CVSS score that functional exploit code exists; 
however, the code is not known to be publicly available.

Vendor Announcements

Cisco has released bug ID CSCuw31632 for registered users, which contains 
additional details and an up-to-date list of affected product versions.

Impact

An unauthenticated, remote attacker could exploit this vulnerability to cause
the Cisco SIP proxy service to stop functioning, resulting in a DoS condition.

Technical Information

The vulnerability is due to improper input validation of the HTTP request sent
to the REST interface.

An unauthenticated, remote attacker could exploit this vulnerability by 
sending a crafted HTTP request to the targeted device. A successful exploit 
could cause the Cisco SIP proxy service to restart, resulting in a DoS 
condition.

Safeguards

Administrators are advised to contact the vendor regarding future updates and
releases.

Administrators are advised to allow only trusted users to have network access.

Administrators are advised to allow only privileged users to access 
administration or management systems.

Administrators are advised to monitor affected systems.

Patches/Software

Software updates are not available.

Alert History

Initial Release

Product Sets

The security vulnerability applies to the following combinations of products.

Primary Products:

Cisco Cisco Unified Communications Manager IM and Presence Service 11.5 (1)

Associated Products:

N/A

LEGAL DISCLAIMER

The urgency and severity ratings of this alert are not tailored to individual
users; users may value alerts differently based upon their network 
configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED 
THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF 
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED 
THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION
IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE
TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES 
THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.

- --------------------------END INCLUDED TEXT--------------------

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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